d The service metadata outputs shall be encoded in XML. e The output contents and formats shall be specified using XML Schema, and those
schemas shall be based on GML wherever applicable. f This operations shall be required implementation by all compliant catalog server
instances.
NOTE That is, a catalog server instance which does not fully implement this operations shall not be
considered compliant with the specification. All the image cataloging server components implemented in the OWS 1.2 testbed shall implement this operations.
This get service metadata operations should be as similar as practical to both the a GetCapabilities operation of the WFS or WRS.
b Get service metadata operations of the catalog services described in Subclause 5.3.2.
5.4.3 Get schema
The catalog function interfaces shall provide one or more operations that together meet the following metadata schemas retrieval requirements:
a This operations shall allow clients to retrieve the data schemas used for selected types of metadata groups that can currently be stored by the catalog server instance.
This operations should not always retrieve the data schemas for all types of metadata that can currently be stored by the catalog server instance. Also, this
operations shall not always retrieve some metadata for all instances of the types.
b This operations shall allow retrieving data schemas for metadata for images and also for other types of geospatial data and metadata that are stored in the same archive
server instance. c The types of metadata groups for which schemas are retrieved shall be able to be
selected by specifying the data type identifiers which can be retrieved from the same catalog service using the get service metadata operations discussed in
Subclause 5.4.2.
d The schema output format shall be XML Schema, and those schemas shall be based on GML wherever applicable.
e This operations shall be required implementation by all compliant catalog server instances.
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This get schema operations should be as similar as practical to both the a DescribeFeatureType operation of the WFS or DescribeRecord operation of the
WRS. b Get schema operations of the archive services described in Subclause 5.3.3.
